Initial framework of the power service

Power/Service/Models/PowerSample.cs

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+using System;
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace ChrisKaczor.HomeMonitor.Power.Service.Models
+{
+    public class PowerSample
+    {
+        [JsonPropertyName("sensorId")]
+        public string SensorId { get; set; }
+
+        [JsonPropertyName("timestamp")]
+        public DateTimeOffset Timestamp { get; set; }
+
+        [JsonPropertyName("channels")]
+        public PowerChannel[] Channels { get; set; }
+
+        [JsonPropertyName("cts")]
+        public Dictionary<string, double>[] CurrentTransformers { get; set; }
+    }
+}